TypeScript 4.3 Iteration Plan

[DanielRosenwasser]

This document outlines our focused tasks for TypeScript 4.3, as well as some of the discussion that explains how/why we prioritized certain work items. Nothing is set in stone, but we will strive to complete them in a reasonable timeframe.

Date	Event
February 23rd	TypeScript 4.2 Release
March 26th	Create 4.3 Beta (4.3.0) Build for Testing
March 30th	TypeScript 4.3 Beta Release
May 7th	Create 4.3 RC (4.3.1) Build for Testing
May 11th	TypeScript 4.3 RC Release
May 21st	Create 4.3 Final (4.3.2) Build for Testing
May 25th	TypeScript 4.3 Final Release 🚀

Language Features

• Generalized index signatures
• Improve support for well-known symbols
• --noImplicitOverride
• ES #private methods
• static index signatures
• Package export maps
• Review the project setup experience
• Investigate different types and visibility modifiers for get/set accessors
• Investigate strictness flag for unknown in catch
• Migrate to modules
• Investigate improved error display
• Investigate faster compile-time iteration

Editor Productivity

• Continue enabling the Language Server Protocol (LSP)
• Investigate auto-import improvements
  • Sorted auto-imports in completions
  • Display result paths in completions
  • Complete import statements through auto-imports
• Improve JSDoc @see and @link support
• Investigate inline hints
• Investigate high-confidence "did you mean?" in JS
• Continue improving TSServer in a worker thread
• Continue improving partial semantic mode
• Investigate improved error UI

Performance

• Profiling/Tracing Mode Improvements

Infrastructure

• Better baseline reports for bot testing
• Perf Regression Tracking
  • Committing Scripts to Repo
  • Integrate into Release Activities
• Perf Suite Reliability

Website

• Continue smoothing out first user experience
• Create project setup documentation
• Fix display issues on sample error spans
• Switch to new handbook

DefinitelyTyped

• Continue improving processes and performance

[orta]

Linking to #41601

[orta]

Linking lib DOM changes: microsoft/TypeScript-DOM-lib-generator#991

[thetrompf]

What happened to April in the release plan?

[RyanCavanaugh]

What happened to April in the release plan?

Some portions of our iteration are longer than 28 days and thus certain months may be implicit in the schedule depending on where dates fall.

[DanielRosenwasser]

@typescript-bot create release-4.3

[typescript-bot]

Heya @DanielRosenwasser, I've started to create the release-4.3 branch for you. Here's the link to my best guess at the log.